.eslintrc.js

module.exports = {
  parser: 'babel-eslint',
  parserOptions: {
    ecmaVersion: 6,
    sourceType: 'module',
    allowImportExportEverywhere: false,
    ecmaFeatures: {
      jsx: true,
    },
  },
  env: {
    browser: true,
    es6: true,
    node: true,
    jquery: true,
  },
  globals: {
    __DEV__: true,
    __HOST__: true,
    UTCDate: true,
    ecData: true,
  },
  plugins: ['react', 'flowtype', 'prettier'],
  extends: ['eslint:recommended', 'plugin:react/recommended'],
  rules: {
    'react/sort-comp': [
      2,
      {
        order: ['type-annotations', 'life-cycle', 'everything-else', 'render'],
      },
    ],
    'flowtype/boolean-style': [2, 'boolean'],
    'flowtype/define-flow-type': 1,
    'flowtype/generic-spacing': [2, 'never'],
    'flowtype/no-primitive-constructor-types': 2,
    'flowtype/no-weak-types': [
      2,
      {
        any: false,
        Object: false,
        Function: false,
      },
    ],
    'flowtype/object-type-delimiter': [2, 'comma'],
    'flowtype/require-valid-file-annotation': 2,
    'flowtype/semi': [2, 'always'],
    'flowtype/use-flow-type': 1,
    'flowtype/valid-syntax': 1,
    'comma-dangle': [2, 'always-multiline'],
    'no-warning-comments': [
      'warn',
      { terms: ['todo', 'fixme', 'any other term'], location: 'anywhere' },
    ],
    'no-cond-assign': 2,
    'no-console': 0,
    'no-constant-condition': 2,
    'no-control-regex': 2,
    'no-debugger': 2,
    'no-dupe-args': 2,
    'no-dupe-keys': 2,
    'no-duplicate-case': 2,
    'no-empty-character-class': 2,
    'no-empty': 0,
    'no-ex-assign': 2,
    'no-extra-boolean-cast': 2,
    'no-extra-semi': 2,
    'no-func-assign': 2,
    'no-invalid-regexp': 2,
    'no-irregular-whitespace': 2,
    'no-negated-in-lhs': 2,
    'no-obj-calls': 2,
    'no-regex-spaces': 2,
    'no-sparse-arrays': 2,
    'no-unreachable': 2,
    'use-isnan': 2,
    'valid-typeof': 2,
    'block-scoped-var': 2,
    curly: [2, 'all'],
    'default-case': 2,
    'dot-notation': 2,
    eqeqeq: 0,
    semi: 0,
    'max-len': [0, 120],
    'no-alert': 0,
    'no-caller': 2,
    'no-else-return': 2,
    'no-eval': 2,
    'no-extend-native': 2,
    'no-extra-bind': 2,
    'no-fallthrough': 2,
    'no-floating-decimal': 1,
    'no-implicit-coercion': 1,
    'no-useless-escape': 0,
    'no-implied-eval': 1,
    'no-invalid-this': 0,
    'no-loop-func': 0,
    'no-multi-spaces': 2,
    'no-native-reassign': 2,
    'no-proto': 2,
    'no-redeclare': 2,
    'no-useless-call': 2,
    'no-delete-var': 2,
    'no-undef': 0,
    'no-unused-vars': [2, { args: 'none', varsIgnorePattern: '[Rr]eact' }],
    'no-use-before-define': 0,
    'brace-style': 1,
    camelcase: 0,
    'comma-spacing': [1, { after: true }],
    'comma-style': 1,
    'eol-last': 1,
    'no-array-constructor': 1,
    'no-continue': 0,
    'no-lonely-if': 0,
    'no-mixed-spaces-and-tabs': 2,
    'no-trailing-spaces': 1,
    'arrow-spacing': [1, { before: true, after: true }],
    'no-const-assign': 1,
    'no-this-before-super': 1,
    'no-var': 2,
    'prefer-const': 0,
    'prefer-spread': 1,
    'prop-types': [0],
    'keyword-spacing': [
      2,
      {
        after: true,
        before: true,
      },
    ],
    'no-inner-declarations': 0,
    'consistent-return': ['error', { treatUndefinedAsUnspecified: false }],
    complexity: ['error', { max: 40 }],
    'prettier/prettier': [
      'error',
      {
        singleQuote: true,
        parser: 'flow',
        trailingComma: 'es5',
        bracketSpacing: true,
        jsxBracketSameLine: true,
      },
    ],
  },
  settings: {
    flowtype: {
      onlyFilesWithFlowAnnotation: false,
    },
  },
};